Find the plastic limit and natural density of the soil at a depth of 15m in the borehole log.
A) Plastic limit: 18%, Natural density: 1.65 g/cm3
B) Plastic limit: 22%, Natural density: 1.75 g/cm3
C) Plastic limit: 20%, Natural density: 1.70 g/cm3
D) Plastic limit: 16%, Natural density: 1.60 g/cm3